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《Chinese Journal of Geophysics》 2001-04
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MULTI-PARAMETER MIGRATION IMAGING OF MAGNETOTELLURIC DATA USING FINITE DIFFERENCE METHOD

YU PENG WANG JIA LIN\ WU JIAN SHENG (Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China)[  
Based on systematic study of EM imaging techniques, this paper summarizes the achievements carried out by former researches and points out the limitations of simple model tests. The paper puts forward the migration imaging technique of magnetotelluric data by introducing an improved finite difference method and using the experience of Zhdanov for reference, which increases the accuracy of the difference equation and the imaging resolution by preserving the first order derivative of wave number in horizontal direction. Moreover, the paper also makes further researches on selecting of the suitable conductivity background by adopting the rapid approximate inversion result, joint imaging of two polarizaed modes, multi parameters and second process imaging. Based on the results of the synthetic and the real field observed MT data, the provided multi parameter migration imaging technique has been tested as a more accurate and effective measures for MT data imaging, especially for the study of complicated geological problems. [
【Fund】: 国家自然科学基金资助项目 ( 49894 1 90 )
【CateGory Index】: P631
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